Mars rover on the brink of crater
New Scientist

NASA’s Mars rover Opportunity is now perched on the brink of a 130-metre-wide crater and is surveying the site for a possible descent – from which it might never return. The prospect of exploring Endurance crater is exciting mission scientists, who hope there will be even more bedrock exposed than in the much smaller crater in which Opportunity landed. In that crater, dubbed Eagle, the rover found clear evidence that large quantities of liquid water once existed on Mars.